Liner regression model | R2 | RMSE | F | Sig. |
CEC1 = 2.031 × 10−16 − 0.004pH − 0.157OM + 0.550FexOy + 0.366Silt − 0.089Clay | 0.450 | 0.84 | 2.91 | 0.041* |
CEC2 = −2.354 × 10−16 − 0.074pH − 0.170OM + 0.631FexOy + 0.271Silt + 0.075Clay | 0.550 | 0.75 | 4.41 | 0.009** |
CEC3 = −6.433 × 10−16 − 0.060pH − 0.243OM + 0.640FexOy + 0.247Silt + 0.076Clay | 0.543 | 0.76 | 4.28 | 0.010* |
ΔCEC2−1 = −6.472 × 10−16 − 0.202pH − 0.001OM + 0.227FexOy − 0.237Silt + 0.251Clay | 0.223 | 0.10 | 1.03 | 0.429 |
ΔCEC3−2 = −4.376 × 10−16 + 0.078pH − 0.532OM + 0.052FexOy − 0.095Silt − 0.038Clay | 0.314 | 0.94 | 1.65 | 0.199 |